Looks great. I don’t see any issues with fit.

I watched a video by some Russian guy that made a tumbling design like yours but did it by putting strips together like you would for a chessboard pattern. That greatly reduces the glue up mistakes and cuts the assembly time so you can get clamps on it quickly. The downside is each of the diamonds is 2 pieces, so it’s a little different.

Just found the video.

https://youtu.be/5n0LdU8ZOJU

Losing fingers since 1969